Search a text within the file content in Unix and R

 In UNIX:

grep -rnw '.' -e 'texttosearch'

To search within the current directory '.' or 'path" to search in the path.

The options

-r means "recursive"

-e is the pattern to search for

-n Each output line is preceded by its relative line number in the file, starting at line 1.

-w The expression is searched for as a word (as if surrounded by ‘[[:<:]]’ and ‘[[:>:]]

Do not hesitate to do a man grep to see the dozens of options!

In R, a equivalent using "brut force" (without recursive option) is found in the package HelpersMG (https://CRAN.R-project.org/package=HelpersMG) :

inside(
  text = stop("A text to be searched for is necessary"),
  path = ".",
  pattern = "*\\.R$",
  showallfilenames = FALSE,
  ...,
  fixed = TRUE,
  ignore.case = FALSE
)